I recently installed windows 8.1 using bootcamp and it worked well for a few days. For some reason when I turned on my computer it switched to the mac partition. When I turned off the computer and tried to switch to windows, I just got a black screen with no cursor or anything, although it didn't look like the computer was completely shut off. Now, I can easily go on to apple, but whenever I try to use windows I keep getting a black screen with no cursor. I tried searching up what the problem was, but I can't find any solutions.Thanks in advance!
MacBook Pro with Retina display, OS X El Capitan (10.11.6)